Your pregnancy: 17 weeks

How your baby’s growing:

Your baby weighs 5 ounces now (about as much as a turnip), and he’s around 5 inches long. He can move his joints, and his skeleton — until now rubbery cartilage — is starting to harden to bone. His sense of hearing is also developing. The umbilical cord, his lifeline to the placenta, is growing stronger and thicker.